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83
-
507
-
013 Rev. D
53
NOTE
The address (ADR n) command must return an “OK” response b
e
fore any
other comman
ds are accepted.
7.5.2
Multi power supply co
n
nection to RS232 or RS485 bus
Up to 31 units can be connected (daisy chained) to the RS232 or RS
485 bus. The first unit connects
to the co
n
troller via RS232 or RS485 and the other units are connected via the RS485 bus.
1. First unit connection: Refer to Section 7.5.1 for connecting the first unit to the controller.
2. Other units connection: The o
ther units on the bus are connected via their RS485 interface.
Refer to Figure 7
-
5 for typical connection.
-
Set rear panel setup switch SW1
-
6 to its UP position.
-
Using the Linking cable supplied with each unit (refer to Fig. 7
-
6), connect
each unit OUT
conne
c
tor to the next unit IN connector.
7.6 COMMUNICATION INTERFACE PROTOCOL
7.6.1 Data format
Serial data format is 8 bit, one start bit and one stop bit. No parity bit.
7.6.2
Addressing
The Address is sent separately from th
e command. It is recommended to add 100msec delay b
e-
tween query or sent command to next unit addressing. Refer to Section 7.8.3 for d
e
tails.
7.6.3
End of Message
The end of message is the Carriage Return character (ASCII 13). The power supply ignores the Line
Fe
ed (ASCII 10) character.
7.6.4
Command Repeat
The backslash character “
\
” will cause the last command to be repeated.
7.6.5
Checksum
The user may add a checksum (optional) to the end of the command. The checksum is “$” followed
by two hex characters. If a command or a
query has a checksum, the response will also have one.
There is no CR between the command string and the “$” sign.
Example: STT?3A
STAT?$7B
7.6.6
Acknowledge
The power supply acknowledges received commands by returning an “OK” message. If an e
rror is
detected the power supply will return an error message. The rules of checksum also apply to the a
c-
know
l
edge.
IN
OUT
POWER SUPPLY
#1
IN
OUT
POWER SUPPLY
#2
IN
OUT
POWER SUPPLY
#3
IN
OUT
POWER SUPPLY
#31
RS232/RS485
RS485
RS485
RS485
Fig7-5: Multiple power supply RS232/485 connection
8
1
1
8
1
6
3
5
4
1
6
3
5
4
PIN NO.
HOUSING
HOUSING
PIN NO.
NAME
NAME
SHIELD
SG
TXD
TXD
RXD
RXD
SHIELD
SG
RXD
RXD
TXD
TXD
-
+
+
+
+
-
-
-
Serial link cable with RJ-45 shielded connectors (P/N: GEN/RJ-45)
Fig.7-6:
L=0.5m typ.